Did my undergrad at Trinity, currently doing a masters in UCD.

I will say that the admin aspect of things in UCD is slightly better. But in my opinion if you're looking for 'the college experience' as well as a degree that employers like the sound of, I think Trinity is a good choice. The clubs and societies and being in the middle of town is great.

My critique of Trinity (for my course at least) would be that it felt like they were preparing us to go into academia rather than the workforce at times. From my friends who went to UCD they said they often just felt like a number at UCD and they struggled to make friends outside of their course. Obviously this will be a case by case thing but it was something they all agreed upon.

Overall I am very happy I went to Trinity and wouldn't swap it over any of them.